Editor’s note: This article was last updated on July 4, 2021. It has been reviewed by Cars.com Senior News Editor Jennifer Harrington and is still accurate. Defrosters clear condensation from windows ...

Dear Tom and Ray: I have a great, wonderful, sweet co-worker who might be as wacky as a loon. It was zero degrees Fahrenheit last week, and she refused to use her rear defroster, claiming it would ...